## Source is 15.24 cm away from the left PMT

## Source is 35.56 cm away from the left PMT

## Source is 56.2 cm away from the left PMT

## Source is 76.835cm away from the left PMT

## Source is 87.31 cm away from the left PMT

## Calibration curve

The slope is 0.1381 ns/cm or 7.24 cm/ns.